参数资料
型号: MC68HC11F1CFN4
厂商: Freescale Semiconductor
文件页数: 84/158页
文件大小: 0K
描述: IC MCU 512 EEPROM 4MHZ 68-PLCC
标准包装: 18
系列: HC11
核心处理器: HC11
芯体尺寸: 8-位
速度: 4MHz
连通性: SCI,SPI
外围设备: POR,WDT
输入/输出数: 30
程序存储器类型: ROMless
EEPROM 大小: 512 x 8
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.75 V ~ 5.25 V
数据转换器: A/D 8x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 68-LCC(J 形引线)
包装: 管件
CENTRAL PROCESSING UNIT
TECHNICAL DATA
3-7
3.1.6.8 Stop Disable (S)
Setting the STOP disable (S) bit prevents the STOP instruction from putting the
M68HC11 into a low-power stop condition. If the CPU encounters a STOP instruction
while the S bit is set, it is treated as a no-operation (NOP) instruction, and processing
continues to the next instruction. S is set by reset — STOP disabled by default.
3.2 Data Types
The M68HC11 CPU supports the following data types:
Bit data
8-bit and 16-bit signed and unsigned integers
16-bit unsigned fractions
16-bit addresses
A byte is eight bits wide and can be accessed at any byte location. A word is composed
of two consecutive bytes with the most significant byte at the lower value address. Be-
cause the M68HC11 is an 8-bit CPU, there are no special requirements for alignment
of instructions or operands.
3.3 Opcodes and Operands
The M68HC11 family of microcontrollers uses 8-bit opcodes. Each opcode identifies
a particular instruction and associated addressing mode to the CPU. Several opcodes
are required to provide each instruction with a range of addressing capabilities. Only
256 opcodes would be available if the range of values were restricted to the number
able to be expressed in 8-bit binary numbers.
A four-page opcode map has been implemented to expand the number of instructions.
An additional byte, called a prebyte, directs the processor from page 0 of the opcode
map to one of the other three pages. As its name implies, the additional byte precedes
the opcode.
A complete instruction consists of a prebyte, if any, an opcode, and zero, one, two, or
three operands. The operands contain information the CPU needs for executing the
instruction. Complete instructions can be from one to five bytes long.
3.4 Addressing Modes
Six addressing modes can be used to access memory: immediate, direct, extended,
indexed, inherent, and relative. These modes are detailed in the following paragraphs.
All modes except inherent mode use an effective address. The effective address is the
memory address from which the argument is fetched or stored, or the address from
which execution is to proceed. The effective address can be specified within an in-
struction, or it can be calculated.
3.4.1 Immediate
In the immediate addressing mode an argument is contained in the byte(s) immediate-
ly following the opcode. The number of bytes following the opcode matches the size
of the register or memory location being operated on. There are two-, three-, and four-
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